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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: iSCSI: INQUIRY page 0x83 identifierJP, The identifier in this page of Inquiry is NOT at the 'target device' or 'iSCSI device' layer. It is an identifier for the logical unit to which the inquiry command was sent. The FC format was meant primarily for FC disk drives that have only one logical unit (though it can be used in some ways by FC controllers, etc.). The Device (as in a container of one or more logical units) identifier is yet to be fully defined in SCSI, which is one reason that iSCSI NDT chose to define such a name for the iSCSI device. As for an iSCSI type or format for logical unit identifiers: 1) SCSI already allows for an ascii formatted identifier (typically this includes vendor, model, serial number). Since NDT has defined WWUIs for DEVICES and these have a defined UTF-8 format, there is nothing to *prevent* a vendor from using these strings as the starting point for LU page 83 identifiers of the logical units within that device. 2) But..., iSCSI and NDT should not attempt to make a rule under which these are used. FC's intervention in this was more as a strong suggestion, and is certainly not a requirement. Did I confuse things even more? Jim Hafner Raghavendra Rao <jp.raghavendra@sun.com>@ece.cmu.edu on 01/23/2001 08:02:05 AM Please respond to Raghavendra Rao <jp.raghavendra@sun.com> Sent by: owner-ips@ece.cmu.edu To: ips@ece.cmu.edu cc: Subject: iSCSI: INQUIRY page 0x83 identifier This may seem like a T10 issue at a high level, but I'm concerned that SPC-2 (SCSI primary command set) defines in the INQUIRY page 0x83 identifier type field, a FC identifier type (value = 3). What identifer type should an iSCSI target use to report a LU identifier when queried for page 0x83 ? Luckily there seem to be a generic IEEE extended identifier type (value = 2). Is the naming and discovery document going to provide a clear defintion about LU names ? I understand that there should be NO interconnect specific identifier at the SCSI layer - But SPC-2 is already polluted with a FC identifier type. -JP
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